/* ============================================================
   devtools-hub — "Engineering Blueprint" aesthetic
   Dark ink-blue canvas · faint schematic grid · cyan + amber
   Monospace-forward. 100% static, zero dependencies.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Space+Mono:wght@400;700&family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600&display=swap');

:root {
  --ink-900: #050a12;
  --ink-800: #071018;
  --ink-700: #0b1826;
  --ink-600: #102436;
  --line: rgba(90, 190, 220, 0.10);
  --line-strong: rgba(90, 190, 220, 0.22);
  --cyan: #35e6ff;
  --cyan-dim: #1a9fb8;
  --amber: #ffb547;
  --amber-dim: #b87c26;
  --red: #ff5c72;
  --green: #58e6a0;
  --txt: #dcecf2;
  --txt-dim: #7d9aa8;
  --txt-faint: #4a6373;
  --radius: 4px;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
  --display: 'Space Mono', monospace;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--sans);
  color: var(--txt);
  background-color: var(--ink-800);
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    radial-gradient(circle at 15% 0%, rgba(53, 230, 255, 0.06), transparent 45%),
    radial-gradient(circle at 90% 100%, rgba(255, 181, 71, 0.05), transparent 40%);
  background-size: 28px 28px, 28px 28px, 100% 100%, 100% 100%;
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---- Layout shell ---- */
.shell {
  display: grid;
  grid-template-columns: 264px 1fr;
  min-height: 100vh;
}

/* ---- Sidebar / tool rail ---- */
.rail {
  border-right: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(7,16,24,0.6), rgba(5,10,18,0.9));
  padding: 26px 18px;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 4px;
}
.brand .mark {
  font-family: var(--display);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: -0.5px;
  color: var(--txt);
}
.brand .mark b { color: var(--cyan); }
.brand .rev {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--amber);
  border: 1px solid var(--amber-dim);
  border-radius: 3px;
  padding: 1px 5px;
  letter-spacing: 0.5px;
}
.tagline {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--txt-faint);
  letter-spacing: 0.3px;
  margin-bottom: 26px;
  text-transform: uppercase;
}

.rail-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--txt-faint);
  text-transform: uppercase;
  margin: 0 0 10px 6px;
}

.nav { list-style: none; display: flex; flex-direction: column; gap: 2px; }
.nav button {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 11px;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--txt-dim);
  font-family: var(--mono);
  font-size: 13px;
  padding: 9px 11px;
  cursor: pointer;
  text-align: left;
  transition: all 0.14s ease;
}
.nav button .idx {
  font-size: 10px;
  color: var(--txt-faint);
  min-width: 16px;
}
.nav button:hover {
  color: var(--txt);
  border-color: var(--line-strong);
  background: rgba(53, 230, 255, 0.04);
}
.nav button.active {
  color: var(--cyan);
  border-color: var(--cyan-dim);
  background: rgba(53, 230, 255, 0.08);
  box-shadow: inset 2px 0 0 var(--cyan);
}
.nav button.active .idx { color: var(--cyan-dim); }

.rail-foot {
  margin-top: auto;
  padding-top: 22px;
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--txt-faint);
  line-height: 1.7;
}
.rail-foot .dot { color: var(--green); }
.rail-foot a { color: var(--txt-dim); text-decoration: none; border-bottom: 1px dotted var(--txt-faint); }
.rail-foot a:hover { color: var(--cyan); }

/* ---- Main workspace ---- */
.work {
  padding: 40px 48px 80px;
  max-width: 1000px;
  width: 100%;
}

.tool { display: none; animation: rise 0.35s ease both; }
.tool.active { display: block; }
@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tool-head { margin-bottom: 26px; }
.tool-head .crumb {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--cyan-dim);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 8px;
}
.tool-head h1 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 30px;
  letter-spacing: -1px;
  color: var(--txt);
}
.tool-head p {
  color: var(--txt-dim);
  font-size: 14px;
  margin-top: 6px;
  max-width: 62ch;
}

/* ---- Field / panels ---- */
.field { margin-bottom: 18px; }
.field-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.5px;
  color: var(--txt-dim);
  text-transform: uppercase;
  margin-bottom: 7px;
}
.field-label .meta { color: var(--txt-faint); text-transform: none; letter-spacing: 0; }

textarea, input[type="text"], input[type="number"], select {
  width: 100%;
  background: var(--ink-900);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--txt);
  font-family: var(--mono);
  font-size: 13.5px;
  padding: 13px 15px;
  resize: vertical;
  transition: border-color 0.15s, box-shadow 0.15s;
}
textarea { min-height: 150px; line-height: 1.6; }
textarea.tall { min-height: 220px; }
textarea:focus, input:focus, select:focus {
  outline: none;
  border-color: var(--cyan-dim);
  box-shadow: 0 0 0 3px rgba(53, 230, 255, 0.08);
}
textarea::placeholder, input::placeholder { color: var(--txt-faint); }
textarea[readonly], input[readonly] { color: var(--txt); background: #030710; }

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%2335e6ff' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 34px;
  cursor: pointer;
}

/* ---- Buttons / controls row ---- */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  align-items: center;
  margin-bottom: 18px;
}
.controls .spacer { flex: 1; }

button.btn {
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.3px;
  padding: 9px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  background: var(--ink-700);
  color: var(--txt);
  cursor: pointer;
  transition: all 0.14s ease;
  display: inline-flex;
  align-items: center;
  gap: 7px;
}
button.btn:hover { border-color: var(--cyan-dim); color: var(--cyan); transform: translateY(-1px); }
button.btn:active { transform: translateY(0); }
button.btn.primary {
  background: linear-gradient(180deg, rgba(53,230,255,0.16), rgba(53,230,255,0.06));
  border-color: var(--cyan-dim);
  color: var(--cyan);
}
button.btn.primary:hover { box-shadow: 0 4px 18px rgba(53,230,255,0.18); }
button.btn.ghost { background: transparent; }
button.btn.amber { border-color: var(--amber-dim); color: var(--amber); }
button.btn.amber:hover { color: var(--amber); box-shadow: 0 4px 18px rgba(255,181,71,0.14); }

.inline-opts { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.inline-opts label {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--txt-dim);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}
.inline-opts input[type="radio"], .inline-opts input[type="checkbox"] { accent-color: var(--cyan); cursor: pointer; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 720px) { .grid-2 { grid-template-columns: 1fr; } }

/* ---- Status line ---- */
.status {
  font-family: var(--mono);
  font-size: 12px;
  padding: 9px 13px;
  border-radius: var(--radius);
  border: 1px solid var(--line-strong);
  margin-bottom: 16px;
  display: none;
  align-items: center;
  gap: 8px;
}
.status.show { display: flex; }
.status.ok { color: var(--green); border-color: rgba(88,230,160,0.3); background: rgba(88,230,160,0.05); }
.status.err { color: var(--red); border-color: rgba(255,92,114,0.3); background: rgba(255,92,114,0.05); }
.status.info { color: var(--cyan); border-color: var(--cyan-dim); background: rgba(53,230,255,0.05); }

/* ---- Result cards (JWT, timestamp) ---- */
.cards { display: flex; flex-direction: column; gap: 14px; }
.card {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--ink-900);
  overflow: hidden;
}
.card-head {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 9px 14px;
  border-bottom: 1px solid var(--line);
  color: var(--amber);
  background: rgba(255,181,71,0.04);
}
.card-body { padding: 14px; font-family: var(--mono); font-size: 13px; }
.kv { display: grid; grid-template-columns: 140px 1fr; gap: 6px 14px; }
.kv dt { color: var(--txt-dim); }
.kv dd { color: var(--txt); word-break: break-word; }
pre.json {
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--txt);
  margin: 0;
}
.tok-h { color: var(--red); }
.tok-p { color: var(--cyan); }
.tok-s { color: var(--txt-faint); }

.hint { font-family: var(--mono); font-size: 11.5px; color: var(--txt-faint); margin-top: 6px; }

/* ---- Regex tester ---- */
.rx-pattern {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  min-width: 240px;
  background: var(--ink-900);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: 4px 10px;
}
.rx-pattern:focus-within { border-color: var(--cyan-dim); box-shadow: 0 0 0 3px rgba(53,230,255,0.08); }
.rx-pattern .rx-delim { color: var(--amber); font-family: var(--mono); font-size: 15px; }
.rx-pattern input { border: none; background: transparent; box-shadow: none; padding: 7px 4px; }
.rx-pattern input:focus { box-shadow: none; }
#rx-flags { flex: 0 0 64px; color: var(--amber); }
.rx-out, .diff-out {
  background: var(--ink-900);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.65;
  padding: 13px 15px;
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 60px;
  color: var(--txt);
}
mark.rx-mark {
  background: rgba(255,181,71,0.22);
  color: var(--amber);
  border-radius: 2px;
  padding: 0 1px;
  box-shadow: inset 0 -1px 0 var(--amber-dim);
}

/* ---- Text diff ---- */
.diff-out { padding: 8px 0; white-space: normal; }
.diff-line {
  display: flex;
  gap: 10px;
  padding: 1px 15px;
  white-space: pre-wrap;
  word-break: break-word;
}
.diff-line .diff-sign { flex: 0 0 12px; color: var(--txt-faint); text-align: center; user-select: none; }
.diff-line.add { background: rgba(88,230,160,0.10); color: var(--green); }
.diff-line.add .diff-sign { color: var(--green); }
.diff-line.del { background: rgba(255,92,114,0.10); color: var(--red); }
.diff-line.del .diff-sign { color: var(--red); }
.diff-line.eq { color: var(--txt-dim); }

/* copy toast */
.toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--ink-600);
  border: 1px solid var(--cyan-dim);
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 12.5px;
  padding: 10px 18px;
  border-radius: var(--radius);
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  z-index: 50;
  box-shadow: 0 8px 30px rgba(0,0,0,0.5);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---- Crawlable cross-links (plain <a>, all tool pages) ---- */
.crawl-links {
  max-width: 1000px;
  margin: 10px 48px 40px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--txt-faint);
}
.crawl-links a { color: var(--txt-dim); text-decoration: none; margin-right: 14px; }
.crawl-links a:hover { color: var(--cyan); }
@media (max-width: 760px) { .crawl-links { margin: 10px 20px 30px; } }

/* mobile */
@media (max-width: 760px) {
  .shell { grid-template-columns: 1fr; }
  .rail { position: relative; height: auto; flex-direction: column; }
  .nav { flex-direction: row; flex-wrap: wrap; }
  .nav button { width: auto; }
  .rail-foot { display: none; }
  .work { padding: 28px 20px 60px; }
}